Move tenant settings on separate model (#196)

spec/factories/tenant_settings.rb

@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :tenant_setting do
+    brand_display { 0 }
+    tenant
+  end
+end

spec/models/tenant_setting_spec.rb

@@ -0,0 +1,22 @@
+require 'rails_helper'
+
+RSpec.describe TenantSetting, type: :model do
+  let(:tenant_setting) { FactoryBot.build(:tenant_setting) }
+
+  it 'should be valid' do
+    expect(tenant_setting).to be_valid
+  end
+
+  it 'has a setting brand_display' do
+    expect(tenant_setting.brand_display).to eq('name_and_logo')
+
+    tenant_setting.brand_display = 'name_only'
+    expect(tenant_setting).to be_valid
+
+    tenant_setting.brand_display = 'logo_only'
+    expect(tenant_setting).to be_valid
+
+    tenant_setting.brand_display = 'no_name_no_logo'
+    expect(tenant_setting).to be_valid
+  end
+end